[PATCH 2/4] KVM: x86: zero base3 of unusable segments

[Radim KrÄmÃÅ]

Static checker noticed that base3 could be used uninitialized if the
segment was not present (useable).  Random stack values probably would
not pass VMCS entry checks.

Reported-by:  Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: 1aa366163b8b ("KVM: x86 emulator: consolidate segment accessors")
Signed-off-by: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b54125b590e8..eed8272dd52e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5053,6 +5053,8 @@ static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
 
 	if (var.unusable) {
 		memset(desc, 0, sizeof(*desc));
+		if (base3)
+			*base3 = 0;
 		return false;
 	}
 
-- 
2.13.0